In the countries underdeveloped in particular in medium rural, the subsoil waters constitute an invaluable resource but they remain fragile and vulnerable because of the demographic pressure, of the uncontrolled exploitation of the discharges, the absence of system of adequate cleansing and of husbandries. This present work aims to evaluate physicochemical and metal quality waters of 10 wells collecting the ground water of the chief town of the commune of Sinthiou Maléme. Results obtained by the method spectrophotometric showed that waters are moderately mineralized, soft and acidic. The average contents of salts (fluorides, chlorides and sulphates), minerals (calcium and magnesium) and made up nitrogenized (ammonium, nitrites and nitrates) are variable but remain in the optimum of WHO for drink. It also revealed the presence of certain trace elements such as iron, copper and zinc with the state of traces. However the parameters such as chromium hexavalent and the phosphates ions respectively downgrade these subsoil waters like non drinking water. Thus, the development of a method for the efficient removal of hexavalent chromium in these waters is imperative.

Keywords: Underground, wells, spectrophotometric, chromium hexavalent, phosphates, Traces elements.